One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,8)(5,7)(9,10,12,13)(11,15,16,14)(25,26)(27,29)(28,30)(31,32)(1,3,5,4)(2,6,7,8)(10,13)(11,16)(17,18)(19,22)(20,21)(23,24)(25,27)(26,29)(28,31)(30,32)(1,4,5,3)(2,6,7,8)(9,11,12,16)(10,14,13,15)(18,21)(22,24)(27,31)(29,32)(11,16)(14,15)(26,30)(29,32) involution — undirected(17,19,20,23)(18,22,21,24)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.